variable if it exists, or lexicographic order otherwise. See
linkgit:git-config[1].
+--color[=<when>]:
+ Respect any colors specified in the `--format` option. The
+ `<when>` field must be one of `always`, `never`, or `auto` (if
+ `<when>` is absent, behave as if `always` was given).
+
-i::
--ignore-case::
Sorting and filtering tags are case insensitive.